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syscon.c
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syscon.h
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syscon_generic.c
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syscon_generic.h
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syscon_if.m
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syscon_power.c
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Editing: syscon_generic.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2015 Michal Meloun * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * This is a generic syscon driver, whose purpose is to provide access to * various unrelated bits packed in a single register space. It is usually used * as a fallback to more specific driver, but works well enough for simple * access. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/systm.h> #include <sys/bus.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/rman.h> #include <machine/bus.h> #include <dev/ofw/ofw_bus.h> #include <dev/ofw/ofw_bus_subr.h> #include "syscon_if.h" #include "syscon.h" #include "syscon_generic.h" MALLOC_DECLARE(M_SYSCON); static uint32_t syscon_generic_unlocked_read_4(struct syscon *syscon, bus_size_t offset); static int syscon_generic_unlocked_write_4(struct syscon *syscon, bus_size_t offset, uint32_t val); static int syscon_generic_unlocked_modify_4(struct syscon *syscon, bus_size_t offset, uint32_t clear_bits, uint32_t set_bits); static int syscon_generic_detach(device_t dev); /* * Generic syscon driver (FDT) */ static struct ofw_compat_data compat_data[] = { {"syscon", 1}, {NULL, 0} }; #define SYSCON_LOCK(_sc) mtx_lock_spin(&(_sc)->mtx) #define SYSCON_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->mtx) #define SYSCON_LOCK_INIT(_sc) mtx_init(&(_sc)->mtx, \ device_get_nameunit((_sc)->dev), "syscon", MTX_SPIN) #define SYSCON_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->mtx); #define SYSCON_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_OWNED); #define SYSCON_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->mtx, MA_NOTOWNED); static syscon_method_t syscon_generic_methods[] = { SYSCONMETHOD(syscon_unlocked_read_4, syscon_generic_unlocked_read_4), SYSCONMETHOD(syscon_unlocked_write_4, syscon_generic_unlocked_write_4), SYSCONMETHOD(syscon_unlocked_modify_4, syscon_generic_unlocked_modify_4), SYSCONMETHOD_END }; DEFINE_CLASS_1(syscon_generic, syscon_generic_class, syscon_generic_methods, 0, syscon_class); static uint32_t syscon_generic_unlocked_read_4(struct syscon *syscon, bus_size_t offset) { struct syscon_generic_softc *sc; uint32_t val; sc = device_get_softc(syscon->pdev); SYSCON_ASSERT_LOCKED(sc); val = bus_read_4(sc->mem_res, offset); return (val); } static int syscon_generic_unlocked_write_4(struct syscon *syscon, bus_size_t offset, uint32_t val) { struct syscon_generic_softc *sc; sc = device_get_softc(syscon->pdev); SYSCON_ASSERT_LOCKED(sc); bus_write_4(sc->mem_res, offset, val); return (0); } static int syscon_generic_unlocked_modify_4(struct syscon *syscon, bus_size_t offset, uint32_t clear_bits, uint32_t set_bits) { struct syscon_generic_softc *sc; uint32_t val; sc = device_get_softc(syscon->pdev); SYSCON_ASSERT_LOCKED(sc); val = bus_read_4(sc->mem_res, offset); val &= ~clear_bits; val |= set_bits; bus_write_4(sc->mem_res, offset, val); return (0); } static void syscon_generic_lock(device_t dev) { struct syscon_generic_softc *sc; sc = device_get_softc(dev); SYSCON_LOCK(sc); } static void syscon_generic_unlock(device_t dev) { struct syscon_generic_softc *sc; sc = device_get_softc(dev); SYSCON_UNLOCK(sc); } static int syscon_generic_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) return (ENXIO); device_set_desc(dev, "syscon"); if (!bootverbose) device_quiet(dev); return (BUS_PROBE_GENERIC); } static int syscon_generic_attach(device_t dev) { struct syscon_generic_softc *sc; int rid, rv; sc = device_get_softc(dev); sc->dev = dev; rid = 0; sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (sc->mem_res == NULL) { device_printf(dev, "Cannot allocate memory resource\n"); return (ENXIO); } SYSCON_LOCK_INIT(sc); sc->syscon = syscon_create_ofw_node(dev, &syscon_generic_class, ofw_bus_get_node(dev)); if (sc->syscon == NULL) { device_printf(dev, "Failed to create/register syscon\n"); syscon_generic_detach(dev); return (ENXIO); } if (ofw_bus_is_compatible(dev, "simple-bus")) { rv = simplebus_attach_impl(sc->dev); if (rv != 0) { device_printf(dev, "Failed to create simplebus\n"); syscon_generic_detach(dev); return (ENXIO); } sc->simplebus_attached = true; } return (bus_generic_attach(dev)); } static int syscon_generic_detach(device_t dev) { struct syscon_generic_softc *sc; sc = device_get_softc(dev); if (sc->syscon != NULL) { syscon_unregister(sc->syscon); free(sc->syscon, M_SYSCON); } if (sc->simplebus_attached) simplebus_detach(dev); SYSCON_LOCK_DESTROY(sc); if (sc->mem_res != NULL) bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res); return (0); } static device_method_t syscon_generic_dmethods[] = { /* Device interface */ DEVMETHOD(device_probe, syscon_generic_probe), DEVMETHOD(device_attach, syscon_generic_attach), DEVMETHOD(device_detach, syscon_generic_detach), DEVMETHOD(syscon_device_lock, syscon_generic_lock), DEVMETHOD(syscon_device_unlock, syscon_generic_unlock), DEVMETHOD_END }; DEFINE_CLASS_1(syscon_generic_dev, syscon_generic_driver, syscon_generic_dmethods, sizeof(struct syscon_generic_softc), simplebus_driver); static devclass_t syscon_generic_devclass; EARLY_DRIVER_MODULE(syscon_generic, simplebus, syscon_generic_driver, syscon_generic_devclass, 0, 0, BUS_PASS_DEFAULT); MODULE_VERSION(syscon_generic, 1);
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